Which two substances can not be broken down by chemical change?
(1) c and cuo (3) co2 and cuo
(2) c and cu (4) co2 and cu

Iron (3) oxide will decompose in the presence of hydrogen gas and heater to produced iron and digydrogen monoxide white a balanced chemical equation

What substance has a mass of 9.5g and volume of 2.1cm^3

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.